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Rework self modifying code handling.

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Code blocks now have a varying level of granularity in the page and dirty masks.
Most blocks have 64-byte granularity, but blocks that are repeatedly modified
drop to 1-byte granularity. This reduces the maximum size of the affected block
significantly, but reduces recompilation due to data located too close to code.

If the block is still marked as dirty, then it is recompiled without any
immediate instruction parameters being baked into the recompiled code, instead
being fetched from the RAM array as needed. This severely reduces recompilation
rates on some SMC-heavy games, eg Duke Nukem 3D, System Shock, Screamer etc,
giving a major speedup.
This commit is contained in:
SarahW 2019-03-16 14:53:26 +00:00
commit ab124776a0
36 changed files with 1719 additions and 233 deletions
Download patch file Download diff file Expand all files Collapse all files

7
src/codegen_ops_branch.c
View file

@ -529,6 +529,7 @@ uint32_t ropJ ## cond ## _8(codeblock_t *block, ir_data_t *ir, uint8_t opcode, u
dest_addr &= 0xffff; \
ropJ ## cond ## _common(block, ir, dest_addr); \
\
codegen_mark_code_present(block, cs+op_pc, 1); \
return op_pc+1; \
} \
uint32_t ropJ ## cond ## _16(codeblock_t *block, ir_data_t *ir, uint8_t opcode, uint32_t fetchdat, uint32_t op_32, uint32_t op_pc) \
@ -538,6 +539,7 @@ uint32_t ropJ ## cond ## _16(codeblock_t *block, ir_data_t *ir, uint8_t opcode,
\
ropJ ## cond ## _common(block, ir, dest_addr); \
\
codegen_mark_code_present(block, cs+op_pc, 2); \
return op_pc+2; \
} \
uint32_t ropJ ## cond ## _32(codeblock_t *block, ir_data_t *ir, uint8_t opcode, uint32_t fetchdat, uint32_t op_32, uint32_t op_pc) \
@ -547,6 +549,7 @@ uint32_t ropJ ## cond ## _32(codeblock_t *block, ir_data_t *ir, uint8_t opcode,
\
ropJ ## cond ## _common(block, ir, dest_addr); \
\
codegen_mark_code_present(block, cs+op_pc, 4); \
return op_pc+4; \
}
@ -585,6 +588,7 @@ uint32_t ropJCXZ(codeblock_t *block, ir_data_t *ir, uint8_t opcode, uint32_t fet
uop_JMP(ir, codegen_exit_rout);
uop_set_jump_dest(ir, jump_uop);
codegen_mark_code_present(block, cs+op_pc, 1);
return op_pc+1;
}
@ -611,6 +615,7 @@ uint32_t ropLOOP(codeblock_t *block, ir_data_t *ir, uint8_t opcode, uint32_t fet
uop_JMP(ir, codegen_exit_rout);
uop_set_jump_dest(ir, jump_uop);
codegen_mark_code_present(block, cs+op_pc, 1);
return op_pc+1;
}
@ -647,6 +652,7 @@ uint32_t ropLOOPE(codeblock_t *block, ir_data_t *ir, uint8_t opcode, uint32_t fe
uop_set_jump_dest(ir, jump_uop);
uop_set_jump_dest(ir, jump_uop2);
codegen_mark_code_present(block, cs+op_pc, 1);
return op_pc+1;
}
uint32_t ropLOOPNE(codeblock_t *block, ir_data_t *ir, uint8_t opcode, uint32_t fetchdat, uint32_t op_32, uint32_t op_pc)
@ -682,5 +688,6 @@ uint32_t ropLOOPNE(codeblock_t *block, ir_data_t *ir, uint8_t opcode, uint32_t f
uop_set_jump_dest(ir, jump_uop);
uop_set_jump_dest(ir, jump_uop2);
codegen_mark_code_present(block, cs+op_pc, 1);
return op_pc+1;
}